Certain players transcend time.
Baseball players are bigger, faster, stronger, and more impressive than ever before, and nobody (except maybe Trout, who is also a transcendent talent) is even in the discussion of replicating Babe Ruth, and what he was doing to dead baseballs.
That's another thing. Everyone talks about the equipment advantage McDavid has and nobody is considering the equipment disadvantage Gretzky had.
If he scored 92 with useless hunks of wood, what would be doing with the metal whatever the f*** they use now?